초록 ▼

A diagnostic method and system detects leaks in a vapor handling system of a vehicle that includes a fuel tank and a pressure/vacuum sensor that senses pressure and vacuum in the fuel tank. A canister recovers vapor from the fuel tank. A canister vent solenoid selectively provides atmospheric air to

A diagnostic method and system detects leaks in a vapor handling system of a vehicle that includes a fuel tank and a pressure/vacuum sensor that senses pressure and vacuum in the fuel tank. A canister recovers vapor from the fuel tank. A canister vent solenoid selectively provides atmospheric air to the canister. A controller connected to the canister vent solenoid and the pressure/vacuum sensor executes a leakage detection test that is capable of detecting leaks in the vapor handling system that have a diameter on the order of 0.020 inch. The leakage detection test includes a volatility test phase, a pressure phase, a vacuum phase, an analysis phase and a results phase. In other features, the leakage detection algorithm generates data sets having greater than 25 standard deviations between leakage and no-leakage data sets.

대표청구항 ▼

A diagnostic method and system detects leaks in a vapor handling system of a vehicle that includes a fuel tank and a pressure/vacuum sensor that senses pressure and vacuum in the fuel tank. A canister recovers vapor from the fuel tank. A canister vent solenoid selectively provides atmospheric air to

A diagnostic method and system detects leaks in a vapor handling system of a vehicle that includes a fuel tank and a pressure/vacuum sensor that senses pressure and vacuum in the fuel tank. A canister recovers vapor from the fuel tank. A canister vent solenoid selectively provides atmospheric air to the canister. A controller connected to the canister vent solenoid and the pressure/vacuum sensor executes a leakage detection test that is capable of detecting leaks in the vapor handling system that have a diameter on the order of 0.020 inch. The leakage detection test includes a volatility test phase, a pressure phase, a vacuum phase, an analysis phase and a results phase. In other features, the leakage detection algorithm generates data sets having greater than 25 standard deviations between leakage and no-leakage data sets. way having an inner surface and an annular cutout extending circumferentially about said through passageway and axially along a portion of said through passageway; a sensor element disposed inside said through passageway of said metallic shell and adapted to detect a component of a measurement gas; a sealing material layer mainly made of glass and disposed between said inner surface of said metallic shell adjacent said annular cutout and an outer surface of said sensor element; a first cushion layer disposed in contact with said inner surface of said metallic shell and an end surface of said sealing material layer located on a front-end side with respect to an axial direction of said sensor element, said first cushion layer being formed of a mixture containing filler particles which are superior in heat resistance to glass contained in said sealing material layer, and binder particles which are superior in heat resistance to glass contained in said sealing material layer and are lower in softening temperature than said filler particles; and a second cushion layer disposed in contact with said inner surface of said metallic shell and an end surface of said sealing material layer located on a rear-end side with respect to the axial direction of said sensor element, said second cushion layer being formed of a mixture containing filler particles and a binder containing glass whose softening temperature is slightly lower than that of the glass contained in said sealing material layer. 2. A gas sensor according to claim 1 wherein the gas sensor is used in a motorcycle.